The practice demonstrates that the prediction to adverse geologic condition in front of the heading face by boring radar and BEAM electric method, especially to water-holding condition, is satisfied.
实践表明，采用钻孔雷达和BEAM电法探测技术对隧道掌子面前方的不良地质情况，尤其是含水情况具有较好的预测结果。
Meanwhile, the obvious CO accumulating effect will appear at the front of air curtain zone with the increase of the wind pressure, which is adverse to fire suppression and evacuation.
且随着风压的增加，一氧化碳在空气幕近前方产生明显的累积效应，对火灾扑救与人员疏散不利。
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